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... ll be a leap year every four years. It looks like a child. Everyone knows the common sense, but appearing on the alien world and the earth at the same time is very strange and even terrifying.
"This means that another world has a rotation and revolution period similar to that of the earth.
"Of course, they also have similar gravity, oxygen content, atmosphere and crustal structure, ecosystems, etc.
"You must know that humans have deduced the surrounding galaxies hundreds of ...
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